Cita APA (7a ed.)

Holmes, R. M., & Holmes, S. T. (2001). Mass murder in the United States. Prentice Hall.

Cita Chicago Style (17a ed.)

Holmes, Ronald M., y Stephen T. Holmes. Mass Murder in the United States. Upper Saddle River, NJ [u.a.]: Prentice Hall, 2001.

Cita MLA (9a ed.)

Holmes, Ronald M., y Stephen T. Holmes. Mass Murder in the United States. Prentice Hall, 2001.